Apparatus for controlling an envelope delay in the an envelope-tracking power amplifier and method thereof

Group tracking power amplifier for the envelope signal delay adjustment device provides the envelope signal to provide an envelope signal, the envelope according to an embodiment of the present invention; Negative group delay variable delay to the envelope signal from the envelope signal provided by the output adjustment group to group delay; Envelope modulator for modulating the envelope signal output from the variable the negative group delay of smoke; Group delay difference detector for detecting the group delay difference between the envelope signal and the envelope signal output from the envelope output from the modulator provides the envelope signal group; And it may include a control signal generator for generating a control signal for controlling the group delay value of the variable group delay the negative acting depending on the group delay difference.